Capillary bridge modes driven with modulated ultrasonic radiation pressure

Abstract

The method of modulated ultrasonic radiation pressure, previously used to drive the capillary modes of drops and bubbles, is used to excite the capillary modes of a cylindrical oil bridge in a Plateau tank. Specific modes may be selected by adjusting the modulation frequency and the location or orientation of the bridge in the ultrasonic field. Mode frequencies were measured as a function of the slenderness for the lowest two axisymmetric modes and two nonaxisymmetric modes. The frequencies of the lowest modes agree with an approximate theory which neglects viscous corrections where the interfacial tension is a fitted parameter.

Multifrequency radiation force of acoustic waves in fluids

“…It has been applied for measuring the ultrasound power of ultrasonic transducers [6], inducing oscillation in bubbles [7] and liquid drops [8], and exciting modes in capillary bridges [9]. Furthermore, dynamic radiation force has become the underlying principle in some elastography techniques such as shear wave elasticity imaging [10] and vibro-acoustography [11].…”

A simple model to describe the lateral oscillations of axisymmetric liquid bridges

“…Experiments were conducted on Earth in simulated microgravity using the Plateau-Rayleigh technique. 2,8 Cylindrical 9 and axisymmetric 10 liquid bridges surrounded by air were studied experimentally by using an oscillatory magnetic force and by vibrating the solid supports, respectively. Very recently, 11 optical imaging was used to measure the interface deformation due to small-amplitude lateral vibrations of an axisymmetric millimetric liquid bridge with a precision of the order of m. The results for nearly inviscid liquid bridges were compared with the predictions of the Navier-Stokes ͑NS͒ equations for zero Capillary number.…”

Enhanced damping of capillary bridge oscillations using velocity feedback

“…For liquids in contact with solid the primary geometries which have been investigated include pendant or sessile drops, [16][17][18] the brimful cylinder, 19,20 and capillary bridges. [21][22][23][24][25][26] Damping measurements for capillary modes have been made on free drops, 7,8,10 bubbles, 13,14 and capillary bridges. 23,24 Earthbased damping measurements of pure capillary wave modes are usually performed for relatively small-scale systems, which means low-Q systems for which damping measurements are difficult.…”